--- /dev/null
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright © 2001-2007 Red Hat, Inc.
+ * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
+ *
+ * Created by David Woodhouse <dwmw2@infradead.org>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/crc32.h>
+#include <linux/jffs2.h>
+#include "jffs2_fs_i.h"
+#include "jffs2_fs_sb.h"
+#include <linux/time.h>
+#include "nodelist.h"
+
+static int jffs2_readdir (struct file *, struct dir_context *);
+
+static int jffs2_create (struct inode *,struct dentry *,umode_t,
+ bool);
+static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
+ unsigned int);
+static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
+static int jffs2_unlink (struct inode *,struct dentry *);
+static int jffs2_symlink (struct inode *,struct dentry *,const char *);
+static int jffs2_mkdir (struct inode *,struct dentry *,umode_t);
+static int jffs2_rmdir (struct inode *,struct dentry *);
+static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t);
+static int jffs2_rename (struct inode *, struct dentry *,
+ struct inode *, struct dentry *);
+
+const struct file_operations jffs2_dir_operations =
+{
+ .read = generic_read_dir,
+ .iterate = jffs2_readdir,
+ .unlocked_ioctl=jffs2_ioctl,
+ .fsync = jffs2_fsync,
+ .llseek = generic_file_llseek,
+};
+
+
+const struct inode_operations jffs2_dir_inode_operations =
+{
+ .create = jffs2_create,
+ .lookup = jffs2_lookup,
+ .link = jffs2_link,
+ .unlink = jffs2_unlink,
+ .symlink = jffs2_symlink,
+ .mkdir = jffs2_mkdir,
+ .rmdir = jffs2_rmdir,
+ .mknod = jffs2_mknod,
+ .rename = jffs2_rename,
+ .get_acl = jffs2_get_acl,
+ .set_acl = jffs2_set_acl,
+ .setattr = jffs2_setattr,
+ .setxattr = jffs2_setxattr,
+ .getxattr = jffs2_getxattr,
+ .listxattr = jffs2_listxattr,
+ .removexattr = jffs2_removexattr
+};
+
+/***********************************************************************/
+
+
+/* We keep the dirent list sorted in increasing order of name hash,
+ and we use the same hash function as the dentries. Makes this
+ nice and simple
+*/
+static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
+ unsigned int flags)
+{
+ struct jffs2_inode_info *dir_f;
+ struct jffs2_full_dirent *fd = NULL, *fd_list;
+ uint32_t ino = 0;
+ struct inode *inode = NULL;
+
+ jffs2_dbg(1, "jffs2_lookup()\n");
+
+ if (target->d_name.len > JFFS2_MAX_NAME_LEN)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ dir_f = JFFS2_INODE_INFO(dir_i);
+
+ mutex_lock(&dir_f->sem);
+
+ /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
+ for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
+ if (fd_list->nhash == target->d_name.hash &&
+ (!fd || fd_list->version > fd->version) &&
+ strlen(fd_list->name) == target->d_name.len &&
+ !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
+ fd = fd_list;
+ }
+ }
+ if (fd)
+ ino = fd->ino;
+ mutex_unlock(&dir_f->sem);
+ if (ino) {
+ inode = jffs2_iget(dir_i->i_sb, ino);
+ if (IS_ERR(inode))
+ pr_warn("iget() failed for ino #%u\n", ino);
+ }
+
+ return d_splice_alias(inode, target);
+}
+
+/***********************************************************************/
+
+
+static int jffs2_readdir(struct file *file, struct dir_context *ctx)
+{
+ struct inode *inode = file_inode(file);
+ struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
+ struct jffs2_full_dirent *fd;
+ unsigned long curofs = 1;
+
+ jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino);
+
+ if (!dir_emit_dots(file, ctx))
+ return 0;
+
+ mutex_lock(&f->sem);
+ for (fd = f->dents; fd; fd = fd->next) {
+ curofs++;
+ /* First loop: curofs = 2; pos = 2 */
+ if (curofs < ctx->pos) {
+ jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
+ fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos);
+ continue;
+ }
+ if (!fd->ino) {
+ jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
+ fd->name);
+ ctx->pos++;
+ continue;
+ }
+ jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n",
+ (unsigned long)ctx->pos, fd->name, fd->ino, fd->type);
+ if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type))
+ break;
+ ctx->pos++;
+ }
+ mutex_unlock(&f->sem);
+ return 0;
+}
+
+/***********************************************************************/
+
+
+static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
+ umode_t mode, bool excl)
+{
+ struct jffs2_raw_inode *ri;
+ struct jffs2_inode_info *f, *dir_f;
+ struct jffs2_sb_info *c;
+ struct inode *inode;
+ int ret;
+
+ ri = jffs2_alloc_raw_inode();
+ if (!ri)
+ return -ENOMEM;
+
+ c = JFFS2_SB_INFO(dir_i->i_sb);
+
+ jffs2_dbg(1, "%s()\n", __func__);
+
+ inode = jffs2_new_inode(dir_i, mode, ri);
+
+ if (IS_ERR(inode)) {
+ jffs2_dbg(1, "jffs2_new_inode() failed\n");
+ jffs2_free_raw_inode(ri);
+ return PTR_ERR(inode);
+ }
+
+ inode->i_op = &jffs2_file_inode_operations;
+ inode->i_fop = &jffs2_file_operations;
+ inode->i_mapping->a_ops = &jffs2_file_address_operations;
+ inode->i_mapping->nrpages = 0;
+
+ f = JFFS2_INODE_INFO(inode);
+ dir_f = JFFS2_INODE_INFO(dir_i);
+
+ /* jffs2_do_create() will want to lock it, _after_ reserving
+ space and taking c-alloc_sem. If we keep it locked here,
+ lockdep gets unhappy (although it's a false positive;
+ nothing else will be looking at this inode yet so there's
+ no chance of AB-BA deadlock involving its f->sem). */
+ mutex_unlock(&f->sem);
+
+ ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
+ if (ret)
+ goto fail;
+
+ dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
+
+ jffs2_free_raw_inode(ri);
+
+ jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
+ __func__, inode->i_ino, inode->i_mode, inode->i_nlink,
+ f->inocache->pino_nlink, inode->i_mapping->nrpages);
+
+ unlock_new_inode(inode);
+ d_instantiate(dentry, inode);
+ return 0;
+
+ fail:
+ iget_failed(inode);
+ jffs2_free_raw_inode(ri);
+ return ret;
+}
+
+/***********************************************************************/
+
+
+static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
+{
+ struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
+ struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
+ struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry));
+ int ret;
+ uint32_t now = get_seconds();
+
+ ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
+ dentry->d_name.len, dead_f, now);
+ if (dead_f->inocache)
+ set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink);
+ if (!ret)
+ dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
+ return ret;
+}
+/***********************************************************************/
+
+
+static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
+{
+ struct jffs2_sb_info *c = JFFS2_SB_INFO(d_inode(old_dentry)->i_sb);
+ struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
+ struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
+ int ret;
+ uint8_t type;
+ uint32_t now;
+
+ /* Don't let people make hard links to bad inodes. */
+ if (!f->inocache)
+ return -EIO;
+
+ if (d_is_dir(old_dentry))
+ return -EPERM;
+
+ /* XXX: This is ugly */
+ type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
+ if (!type) type = DT_REG;
+
+ now = get_seconds();
+ ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
+
+ if (!ret) {
+ mutex_lock(&f->sem);
+ set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink);
+ mutex_unlock(&f->sem);
+ d_instantiate(dentry, d_inode(old_dentry));
+ dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
+ ihold(d_inode(old_dentry));
+ }
+ return ret;
+}
+
+/***********************************************************************/
+
+static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
+{
+ struct jffs2_inode_info *f, *dir_f;
+ struct jffs2_sb_info *c;
+ struct inode *inode;
+ struct jffs2_raw_inode *ri;
+ struct jffs2_raw_dirent *rd;
+ struct jffs2_full_dnode *fn;
+ struct jffs2_full_dirent *fd;
+ int namelen;
+ uint32_t alloclen;
+ int ret, targetlen = strlen(target);
+
+ /* FIXME: If you care. We'd need to use frags for the target
+ if it grows much more than this */
+ if (targetlen > 254)
+ return -ENAMETOOLONG;
+
+ ri = jffs2_alloc_raw_inode();
+
+ if (!ri)
+ return -ENOMEM;
+
+ c = JFFS2_SB_INFO(dir_i->i_sb);
+
+ /* Try to reserve enough space for both node and dirent.
+ * Just the node will do for now, though
+ */
+ namelen = dentry->d_name.len;
+ ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
+ ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
+
+ if (ret) {
+ jffs2_free_raw_inode(ri);
+ return ret;
+ }
+
+ inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
+
+ if (IS_ERR(inode)) {
+ jffs2_free_raw_inode(ri);
+ jffs2_complete_reservation(c);
+ return PTR_ERR(inode);
+ }
+
+ inode->i_op = &jffs2_symlink_inode_operations;
+
+ f = JFFS2_INODE_INFO(inode);
+
+ inode->i_size = targetlen;
+ ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
+ ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
+ ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
+
+ ri->compr = JFFS2_COMPR_NONE;
+ ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
+ ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
+
+ fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
+
+ jffs2_free_raw_inode(ri);
+
+ if (IS_ERR(fn)) {
+ /* Eeek. Wave bye bye */
+ mutex_unlock(&f->sem);
+ jffs2_complete_reservation(c);
+ ret = PTR_ERR(fn);
+ goto fail;
+ }
+
+ /* We use f->target field to store the target path. */
+ f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
+ if (!f->target) {
+ pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1);
+ mutex_unlock(&f->sem);
+ jffs2_complete_reservation(c);
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
+ __func__, (char *)f->target);
+
+ /* No data here. Only a metadata node, which will be
+ obsoleted by the first data write
+ */
+ f->metadata = fn;
+ mutex_unlock(&f->sem);
+
+ jffs2_complete_reservation(c);
+
+ ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
+ if (ret)
+ goto fail;
+
+ ret = jffs2_init_acl_post(inode);
+ if (ret)
+ goto fail;
+
+ ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
+ ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
+ if (ret)
+ goto fail;
+
+ rd = jffs2_alloc_raw_dirent();
+ if (!rd) {
+ /* Argh. Now we treat it like a normal delete */
+ jffs2_complete_reservation(c);
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ dir_f = JFFS2_INODE_INFO(dir_i);
+ mutex_lock(&dir_f->sem);
+
+ rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
+ rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
+ rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
+ rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
+
+ rd->pino = cpu_to_je32(dir_i->i_ino);
+ rd->version = cpu_to_je32(++dir_f->highest_version);
+ rd->ino = cpu_to_je32(inode->i_ino);
+ rd->mctime = cpu_to_je32(get_seconds());
+ rd->nsize = namelen;
+ rd->type = DT_LNK;
+ rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
+ rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
+
+ fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
+
+ if (IS_ERR(fd)) {
+ /* dirent failed to write. Delete the inode normally
+ as if it were the final unlink() */
+ jffs2_complete_reservation(c);
+ jffs2_free_raw_dirent(rd);
+ mutex_unlock(&dir_f->sem);
+ ret = PTR_ERR(fd);
+ goto fail;
+ }
+
+ dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
+
+ jffs2_free_raw_dirent(rd);
+
+ /* Link the fd into the inode's list, obsoleting an old
+ one if necessary. */
+ jffs2_add_fd_to_list(c, fd, &dir_f->dents);
+
+ mutex_unlock(&dir_f->sem);
+ jffs2_complete_reservation(c);
+
+ unlock_new_inode(inode);
+ d_instantiate(dentry, inode);
+ return 0;
+
+ fail:
+ iget_failed(inode);
+ return ret;
+}
+
+
+static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode)
+{
+ struct jffs2_inode_info *f, *dir_f;
+ struct jffs2_sb_info *c;
+ struct inode *inode;
+ struct jffs2_raw_inode *ri;
+ struct jffs2_raw_dirent *rd;
+ struct jffs2_full_dnode *fn;
+ struct jffs2_full_dirent *fd;
+ int namelen;
+ uint32_t alloclen;
+ int ret;
+
+ mode |= S_IFDIR;
+
+ ri = jffs2_alloc_raw_inode();
+ if (!ri)
+ return -ENOMEM;
+
+ c = JFFS2_SB_INFO(dir_i->i_sb);
+
+ /* Try to reserve enough space for both node and dirent.
+ * Just the node will do for now, though
+ */
+ namelen = dentry->d_name.len;
+ ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
+ JFFS2_SUMMARY_INODE_SIZE);
+
+ if (ret) {
+ jffs2_free_raw_inode(ri);
+ return ret;
+ }
+
+ inode = jffs2_new_inode(dir_i, mode, ri);
+
+ if (IS_ERR(inode)) {
+ jffs2_free_raw_inode(ri);
+ jffs2_complete_reservation(c);
+ return PTR_ERR(inode);
+ }
+
+ inode->i_op = &jffs2_dir_inode_operations;
+ inode->i_fop = &jffs2_dir_operations;
+
+ f = JFFS2_INODE_INFO(inode);
+
+ /* Directories get nlink 2 at start */
+ set_nlink(inode, 2);
+ /* but ic->pino_nlink is the parent ino# */
+ f->inocache->pino_nlink = dir_i->i_ino;
+
+ ri->data_crc = cpu_to_je32(0);
+ ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
+
+ fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
+
+ jffs2_free_raw_inode(ri);
+
+ if (IS_ERR(fn)) {
+ /* Eeek. Wave bye bye */
+ mutex_unlock(&f->sem);
+ jffs2_complete_reservation(c);
+ ret = PTR_ERR(fn);
+ goto fail;
+ }
+ /* No data here. Only a metadata node, which will be
+ obsoleted by the first data write
+ */
+ f->metadata = fn;
+ mutex_unlock(&f->sem);
+
+ jffs2_complete_reservation(c);
+
+ ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
+ if (ret)
+ goto fail;
+
+ ret = jffs2_init_acl_post(inode);
+ if (ret)
+ goto fail;
+
+ ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
+ ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
+ if (ret)
+ goto fail;
+
+ rd = jffs2_alloc_raw_dirent();
+ if (!rd) {
+ /* Argh. Now we treat it like a normal delete */
+ jffs2_complete_reservation(c);
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ dir_f = JFFS2_INODE_INFO(dir_i);
+ mutex_lock(&dir_f->sem);
+
+ rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
+ rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
+ rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
+ rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
+
+ rd->pino = cpu_to_je32(dir_i->i_ino);
+ rd->version = cpu_to_je32(++dir_f->highest_version);
+ rd->ino = cpu_to_je32(inode->i_ino);
+ rd->mctime = cpu_to_je32(get_seconds());
+ rd->nsize = namelen;
+ rd->type = DT_DIR;
+ rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
+ rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
+
+ fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
+
+ if (IS_ERR(fd)) {
+ /* dirent failed to write. Delete the inode normally
+ as if it were the final unlink() */
+ jffs2_complete_reservation(c);
+ jffs2_free_raw_dirent(rd);
+ mutex_unlock(&dir_f->sem);
+ ret = PTR_ERR(fd);
+ goto fail;
+ }
+
+ dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
+ inc_nlink(dir_i);
+
+ jffs2_free_raw_dirent(rd);
+
+ /* Link the fd into the inode's list, obsoleting an old
+ one if necessary. */
+ jffs2_add_fd_to_list(c, fd, &dir_f->dents);
+
+ mutex_unlock(&dir_f->sem);
+ jffs2_complete_reservation(c);
+
+ unlock_new_inode(inode);
+ d_instantiate(dentry, inode);
+ return 0;
+
+ fail:
+ iget_failed(inode);
+ return ret;
+}
+
+static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
+{
+ struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
+ struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
+ struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry));
+ struct jffs2_full_dirent *fd;
+ int ret;
+ uint32_t now = get_seconds();
+
+ for (fd = f->dents ; fd; fd = fd->next) {
+ if (fd->ino)
+ return -ENOTEMPTY;
+ }
+
+ ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
+ dentry->d_name.len, f, now);
+ if (!ret) {
+ dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
+ clear_nlink(d_inode(dentry));
+ drop_nlink(dir_i);
+ }
+ return ret;
+}
+
+static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev)
+{
+ struct jffs2_inode_info *f, *dir_f;
+ struct jffs2_sb_info *c;
+ struct inode *inode;
+ struct jffs2_raw_inode *ri;
+ struct jffs2_raw_dirent *rd;
+ struct jffs2_full_dnode *fn;
+ struct jffs2_full_dirent *fd;
+ int namelen;
+ union jffs2_device_node dev;
+ int devlen = 0;
+ uint32_t alloclen;
+ int ret;
+
+ if (!new_valid_dev(rdev))
+ return -EINVAL;
+
+ ri = jffs2_alloc_raw_inode();
+ if (!ri)
+ return -ENOMEM;
+
+ c = JFFS2_SB_INFO(dir_i->i_sb);
+
+ if (S_ISBLK(mode) || S_ISCHR(mode))
+ devlen = jffs2_encode_dev(&dev, rdev);
+
+ /* Try to reserve enough space for both node and dirent.
+ * Just the node will do for now, though
+ */
+ namelen = dentry->d_name.len;
+ ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
+ ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
+
+ if (ret) {
+ jffs2_free_raw_inode(ri);
+ return ret;
+ }
+
+ inode = jffs2_new_inode(dir_i, mode, ri);
+
+ if (IS_ERR(inode)) {
+ jffs2_free_raw_inode(ri);
+ jffs2_complete_reservation(c);
+ return PTR_ERR(inode);
+ }
+ inode->i_op = &jffs2_file_inode_operations;
+ init_special_inode(inode, inode->i_mode, rdev);
+
+ f = JFFS2_INODE_INFO(inode);
+
+ ri->dsize = ri->csize = cpu_to_je32(devlen);
+ ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
+ ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
+
+ ri->compr = JFFS2_COMPR_NONE;
+ ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
+ ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
+
+ fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
+
+ jffs2_free_raw_inode(ri);
+
+ if (IS_ERR(fn)) {
+ /* Eeek. Wave bye bye */
+ mutex_unlock(&f->sem);
+ jffs2_complete_reservation(c);
+ ret = PTR_ERR(fn);
+ goto fail;
+ }
+ /* No data here. Only a metadata node, which will be
+ obsoleted by the first data write
+ */
+ f->metadata = fn;
+ mutex_unlock(&f->sem);
+
+ jffs2_complete_reservation(c);
+
+ ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
+ if (ret)
+ goto fail;
+
+ ret = jffs2_init_acl_post(inode);
+ if (ret)
+ goto fail;
+
+ ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
+ ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
+ if (ret)
+ goto fail;
+
+ rd = jffs2_alloc_raw_dirent();
+ if (!rd) {
+ /* Argh. Now we treat it like a normal delete */
+ jffs2_complete_reservation(c);
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ dir_f = JFFS2_INODE_INFO(dir_i);
+ mutex_lock(&dir_f->sem);
+
+ rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
+ rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
+ rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
+ rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
+
+ rd->pino = cpu_to_je32(dir_i->i_ino);
+ rd->version = cpu_to_je32(++dir_f->highest_version);
+ rd->ino = cpu_to_je32(inode->i_ino);
+ rd->mctime = cpu_to_je32(get_seconds());
+ rd->nsize = namelen;
+
+ /* XXX: This is ugly. */
+ rd->type = (mode & S_IFMT) >> 12;
+
+ rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
+ rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
+
+ fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
+
+ if (IS_ERR(fd)) {
+ /* dirent failed to write. Delete the inode normally
+ as if it were the final unlink() */
+ jffs2_complete_reservation(c);
+ jffs2_free_raw_dirent(rd);
+ mutex_unlock(&dir_f->sem);
+ ret = PTR_ERR(fd);
+ goto fail;
+ }
+
+ dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
+
+ jffs2_free_raw_dirent(rd);
+
+ /* Link the fd into the inode's list, obsoleting an old
+ one if necessary. */
+ jffs2_add_fd_to_list(c, fd, &dir_f->dents);
+
+ mutex_unlock(&dir_f->sem);
+ jffs2_complete_reservation(c);
+
+ unlock_new_inode(inode);
+ d_instantiate(dentry, inode);
+ return 0;
+
+ fail:
+ iget_failed(inode);
+ return ret;
+}
+
+static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
+ struct inode *new_dir_i, struct dentry *new_dentry)
+{
+ int ret;
+ struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
+ struct jffs2_inode_info *victim_f = NULL;
+ uint8_t type;
+ uint32_t now;
+
+ /* The VFS will check for us and prevent trying to rename a
+ * file over a directory and vice versa, but if it's a directory,
+ * the VFS can't check whether the victim is empty. The filesystem
+ * needs to do that for itself.
+ */
+ if (d_really_is_positive(new_dentry)) {
+ victim_f = JFFS2_INODE_INFO(d_inode(new_dentry));
+ if (d_is_dir(new_dentry)) {
+ struct jffs2_full_dirent *fd;
+
+ mutex_lock(&victim_f->sem);
+ for (fd = victim_f->dents; fd; fd = fd->next) {
+ if (fd->ino) {
+ mutex_unlock(&victim_f->sem);
+ return -ENOTEMPTY;
+ }
+ }
+ mutex_unlock(&victim_f->sem);
+ }
+ }
+
+ /* XXX: We probably ought to alloc enough space for
+ both nodes at the same time. Writing the new link,
+ then getting -ENOSPC, is quite bad :)
+ */
+
+ /* Make a hard link */
+
+ /* XXX: This is ugly */
+ type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
+ if (!type) type = DT_REG;
+
+ now = get_seconds();
+ ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
+ d_inode(old_dentry)->i_ino, type,
+ new_dentry->d_name.name, new_dentry->d_name.len, now);
+
+ if (ret)
+ return ret;
+
+ if (victim_f) {
+ /* There was a victim. Kill it off nicely */
+ if (d_is_dir(new_dentry))
+ clear_nlink(d_inode(new_dentry));
+ else
+ drop_nlink(d_inode(new_dentry));
+ /* Don't oops if the victim was a dirent pointing to an
+ inode which didn't exist. */
+ if (victim_f->inocache) {
+ mutex_lock(&victim_f->sem);
+ if (d_is_dir(new_dentry))
+ victim_f->inocache->pino_nlink = 0;
+ else
+ victim_f->inocache->pino_nlink--;
+ mutex_unlock(&victim_f->sem);
+ }
+ }
+
+ /* If it was a directory we moved, and there was no victim,
+ increase i_nlink on its new parent */
+ if (d_is_dir(old_dentry) && !victim_f)
+ inc_nlink(new_dir_i);
+
+ /* Unlink the original */
+ ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
+ old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
+
+ /* We don't touch inode->i_nlink */
+
+ if (ret) {
+ /* Oh shit. We really ought to make a single node which can do both atomically */
+ struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
+ mutex_lock(&f->sem);
+ inc_nlink(d_inode(old_dentry));
+ if (f->inocache && !d_is_dir(old_dentry))
+ f->inocache->pino_nlink++;
+ mutex_unlock(&f->sem);
+
+ pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
+ __func__, ret);
+ /* Might as well let the VFS know */
+ d_instantiate(new_dentry, d_inode(old_dentry));
+ ihold(d_inode(old_dentry));
+ new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
+ return ret;
+ }
+
+ if (d_is_dir(old_dentry))
+ drop_nlink(old_dir_i);
+
+ new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
+
+ return 0;
+}
+
Code Review / kvmfornfv.git / blobdiff